# go: writing go.sum: open /path/to/go.sum: permission denied

- **ID:** `go/go-mod-file-permission-denied`
- **Domain:** go
- **Category:** io_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The user does not have write permission to the go.sum file or the directory containing it, often in read-only file systems or CI environments.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.14 | active | — | — |

## Workarounds

1. **** (90% success)
   ```
   Ensure the current user owns the directory: 'chown -R $USER:$USER /path/to/project' or run 'go mod tidy' in a writable location.
   ```
2. **** (85% success)
   ```
   In CI, set the working directory to a writable path and copy go.mod/go.sum there.
   ```

## Dead Ends

- **** — This may change file ownership and cause later permission issues in CI or shared environments. (50% fail)
- **** — This is a security risk and may be reverted by version control systems. (30% fail)